Can lower back pain (lumbar) be cause by not stretching your calf muscles after soccer?

Maybe. Depends on how you're stretching your calves. If you're stretching calves and lower back at the same time then lower back may have been neglected. If you're standing on a plank, and doing calf raises, lower back should not be affected. The other question is are they innerveted by the same nerves? Answer is no.
Unlikely. Not likely but tight muscles at the hamstring level and/or hips can be a sign of a spondylolysis/spondylolisthesis and flexibility maintenance makes for a healthier back.

Related Questions

I have had lower back pain which goes down my hip and right leg. The pain reaches down to my calf. What could be causing it? Muscle relaxers didn't work.

? Sciatic nerve. Please see your physician or orthopedic surgeon to be evaluated for possible sciatica. If your sciatic nerve is inflammed, the medical provider can evaluate for cause to determine what can be done to improve it. Take care. Read more...
Sciatica. True sciatica is leg pain that shoots from back, down the leg past the knee. This mimics the path of the sciatic nerve, thus it's name. Mri of the spine or pelvis would serve to differentiate in most cases if exam and history is not clear. Young patients more likely to have herniated disc. Older patients, pressure from arthritic spurs. All can be treated non-surgically if not getting worse. Read more...
Cause of sciatica. Sciatica is a pain pattern caused by many different mechanisms. Read more...
Could be disc. Agree with dr badgley that your description is of sciatica. Real question to be answered is whether a nerve root in lower back is compressed by a protruded or ruptured disc, or if a more peripheral pain generator such as sacro-iliac dysfnctn or piriformis syndrome may be the cause. Would not expect muscle relaxer to help here. You need to uncover causation, and treat the pain generator itself. Read more...

Difficulty sleeping due to leg muscle sensations. Difficult to relax legs. Side Sleeper. Lower back pain. Lipitor to 40 mg from 20 mg in Oct 2015.

Restless Legs? Here's good info: https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Restless-Legs-Syndrome-Fact-Sheet Talk with your Dr - it's not always easy to treat but it can be resolved in many cases. I hope your case is one! Read more...

Lower back pain and sides of quads hurt after playing soccer? I am 16 year old boy what could be some causes of this? Growing pain?

Lateral thigh pain. Increased tension in muscles and ligaments can cause low back pain and lateral thigh pain. The iliotibial band is a ligament that is situated from the hip to the lateral part of the knee. When this band is 'tight', pain on the outside of the thigh (and sometimes the knee) is experienced. Your soccer coach may have some stretching exercises for you. Read more...
Myalgias. Muscle strain, over-use injury. Could just be lactic build-up after a strenuous soccer game. Gentle stretching, ice therapy for 2-3 days followed by heat therapy, and moderate massage may help. If the pain is so severe that walking is painful or the pain radiates (shoots) anywhere then visit your doc for a physical evaluation. Read more...